java.net.SocketException: Broken pipe

This happens when you write to a TCP connection that has already been
closed by the reading end. Depending on your application, you would
either treat it as an application protocol error or ignore it and give
up. In either case the socket is almost certainly dead and must be
closed, and the client session abandoned.

Reference:

http://forums.sun.com/thread.jspa?threadID=5218565

http://www.flukenetworks.com/fnet/en-us/supportAndDownloads/KB/IT%20Networking/protocol%20expert/What_are_TCP_RST_Packets_-_Protocol_Expert